Of course everytime anything new is found, the people at unfiction forums tear it apart looking for clues to other sites, which usually turn out to be made by fans or completely unrelated. This time it appears they're on to something.
Dr. Awkward googled "kaitei no mitsu" (one of the ingredients if the recipe in my last post...which Lasher pointed out actually translates to something like "seabed nectar" rather than "deep sea crab") and found this restaurant review which seems to be related (and was posted last week, so before the recipe was added to 1-18-08.com). Iconsumer also found a couple of other reviews by the same review (Vernon MacDooble) on other sites here and here, which seem to be unrelated.
The mention of Tagruato in that first review led MrToasty to discover Tagruato.jp, which definitely seems legit (it was registered over two months ago). Slusho is a subsidiary of Tagruato, and the C.E.O. of Tagruato is none other than Ganu Yoshida. There's a lottt of info on this site (which interestingly can only be accessed by choosing English from the main page...the other languages aren't functional). Have fun looking through it. Also, Dr. Awkward called the number on the contact page and got a recording in Japanese and then in English (I assume they said the same thing, but my Japanese is minimal): Thank you for calling Tagruato, due to high call volumes we have transfered your call to the automated answering service. There are NO UPDATES at this time. Please leave us a message and we will return your call.
Also, I find it hilarious that Tagruato's little league team is called The Lions. They must be huge.